Infraware Chief Executive Kwak Min-cheol speaks during an interview with Reuters at his office in central Seoul September 12, 2013. South Korean upstart Infraware Inc is in a David and Goliath battle ... more&nbsp

Infraware Chief Executive Kwak Min-cheol speaks during an interview with Reuters at his office in central Seoul September 12, 2013. South Korean upstart Infraware Inc is in a David and Goliath battle with software giant Microsoft over a lucrative niche of the mobile office business - and just like the diminutive biblical hero, it believes it can win. Infraware already dominates the market for office software applications on Android devices and says it now has a killer strategy to extend that domination to Apple Inc handsets as well - by giving its best-selling Polaris app away for free. Picture taken September 12, 2013. To match Interview MICROSOFT-INFRAWARE/ REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: BUSINESS SCIENCE TECHNOLOGY) less&nbsp